AutoCAD 2007/2008/2009

Distinguished Contributor
Posts: 190
Registered: ‎02-24-2009
Message 1 of 5 (10,254 Views)

Moment of inertia?

10254 Views, 4 Replies
07-30-2010 06:31 AM


I would like to find a way in AutoCAD to calculate the (momet of inertia). In the (help) of AutoCAD exists (moment of inertia) but when I opened it, I foud nothing about (moment of inertia) but only about calculation of the area.

Is there anybody can help me to find a way to do that? Specially, that can be useful in the irregular shapes.



Valued Mentor
Posts: 1,257
Registered: ‎08-17-2007
Message 2 of 5 (10,249 Views)

Re: Moment of inertia?

07-30-2010 08:04 AM in reply to: jz4all
Posts: 16
Registered: ‎03-25-2009
Message 3 of 5 (10,228 Views)

Re: Moment of inertia?

08-01-2010 02:03 AM in reply to: jz4all



once you have created your shape from lines and arcs you will need to create a region from the shape by using the "region" command and selecting all the lines and or arcs after I usually move the bottom left corner of the shape to 0,0. Once you have done this, run the "massprop" command and click the region you created, you will then have a text box that pops up showing the moment of inertia results.


See attached image example.


Hope this helps :smileyhappy:
Distinguished Contributor
Posts: 190
Registered: ‎02-24-2009
Message 4 of 5 (10,215 Views)

Re: Moment of inertia?

08-02-2010 12:07 AM in reply to: jz4all

Thankyou for help.It works fantastic.

New Member
Posts: 1
Registered: ‎02-15-2013
Message 5 of 5 (6,325 Views)

Re: Moment of inertia?

02-15-2013 10:04 PM in reply to: jz4all

What is I & J in below result




rea:                    1437.9615
Perimeter:               491.3206
Bounding box:         X: -96.7383  --  -31.7383
                      Y: 438.3598  --  583.3598
Centroid:             X: -62.7098
                      Y: 517.4386
Moments of inertia:   X: 387984772.1991
                      Y: 5941776.0140
Product of inertia:  XY: -46145896.8066
Radii of gyration:    X: 519.4380
                      Y: 64.2813
Principal moments and X-Y directions about centroid:
                      I: 192305.5258 along [0.1812 0.9834]
                      J: 3075742.0965 along [-0.9834 0.1812]




You are not logged in.

Log into access your profile, ask and answer questions, share ideas and more. Haven't signed up yet? Register

Welcome to the new Autodesk Community!
If this is your first visit, click here to get started and make the most of the Community. Let us know what you think of the new experience in the Community Feedback Forum.

Need installation help?

Start with some of our most frequented solutions to get help installing your software.

Ask the Community

Connect with AutoCAD